21=3(2+3x)-4

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Solution for 21=3(2+3x)-4 equation:


Simplifying
21 = 3(2 + 3x) + -4
21 = (2 * 3 + 3x * 3) + -4
21 = (6 + 9x) + -4

Reorder the terms:
21 = 6 + -4 + 9x

Combine like terms: 6 + -4 = 2
21 = 2 + 9x

Solving
21 = 2 + 9x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-9x' to each side of the equation.
21 + -9x = 2 + 9x + -9x

Combine like terms: 9x + -9x = 0
21 + -9x = 2 + 0
21 + -9x = 2

Add '-21' to each side of the equation.
21 + -21 + -9x = 2 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = 2 + -21
-9x = 2 + -21

Combine like terms: 2 + -21 = -19
-9x = -19

Divide each side by '-9'.
x = 2.111111111

Simplifying
x = 2.111111111

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